Phoenix.Channels: Failing to build

I am new to rust and want to play with this library to build a small cli client but I am running into issues building this crate.

cargo run -- "ws://localhost:4000/socket" secret earth
warning: unused manifest key: build
   Compiling phoenix_channels_client v0.1.2
error[E0425]: cannot find function `consume_budget` in module `task`
   --> /home/tru1ock/.cargo/registry/src/index.crates.io-6f17d22bba15001f/phoenix_channels_client-0.1.2/src/channel.rs:519:23
    |
519 |                 task::consume_budget().await
    |                       ^^^^^^^^^^^^^^ not found in `task`
    
    rustc 1.71.0-nightly (9ecda8de8 2023-04-30
    
    [package]
name = "client"
version = "0.1.0"
edition = "2021"


[dependencies]
phoenix_channels_client = { version = "0.1.2", features = ["nightly"] }
clap = { version = "4.2.5", features = ["derive"] }

[build]
rustflags = ["--cfg", "tokio_unstable"]

Any help would be much appreciated!